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Diverse etiology of hyperlipidemia among hospitalized children in Western region of Saudi Arabia Correspondence

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www.smj.org.sa audi Med J 2017; Vol. 38 (3)

Diverse etiology of hyperlipidemia among hospitalized children in Western region of Saudi Arabia

To the Editor

I have read with interest the study by Al-Agha et al1 on the diverse etiology of hyperlipidemia among hospitalized children in Western region of Kingdom of Saudi Arabia (KSA).In the descending order of frequency, the authors mentioned that those who have shown to have hyperlipidemia with nephrotic syndrome were 35.6%, primary/idiopathic hyperlipidemia 19.4%, diabetes mellitus (DM) 17.8%, hypothyroidism 7.1%, obesity 4.3%, metabolic syndrome (MS) 2.8%, chronic liver disease 2%, and chronic renal failure 1.2%.1 I presume that the actual prevalence of MS-associated hyperlipidemia in the study was underestimated. My assumption is based on the following 2 points.

First, it is obvious that pediatric MS encompasses a constellation of cardiovascular risk factors, notably dyslipidemia, DM, obesity, and hypertension. The prevalence of the latter 3 elements of MS have been substantially reported in KSA over the recent years.

The overall prevalence of DM among children and adolescents has been estimated to be 10.9%, of which 0.5% were known type 1 and type 2 patients with DM and 10.4% were either newly identified cases of DM (4.3%) or impaired fasting glucose (6.1%) with more than 90% of the diabetic patients being unaware of their disease.2 The prevalence of childhood obesity has increased in particular age groups (13-15 years) during a 5-year span from 12.6 [(95% confidence interval) 11.3-13.9] in 2008 to 15.3 [(95% confidence interval) 13.7-16.9] in 2013 (p=0.012).3 Hypertension has been importantly documented in 17.2% of healthy intermediate school children aged 11-18 years.4

Second, there are significant differences in the definition criteria for pediatric MS. Some of these definitions include hyperglycemia after an oral glucose load, while others only consider fasting glycemia; other differences include obesity criteria with different cutoffs for waist circumference or body mass index; different values for dyslipidemia criteria for triglyceride and high density lipoprotein-cholesterol; and different cutoffs for defining hypertension. The approach to each definition differs from the importance that each component or

risk factor assumes.5 The use of different MS criteria makes it difficult to know the exact prevalence of MS in a particular pediatric population. This is obvious on noticing that the prevalence of pediatric MS in KSA has been estimated to range from 2-18% according to the sensitivity of the 6 different MS definitions.6 It was not obvious which MS definition was employed in Al-Agha et al’s study.1

Mahmood D. Al-Mendalawi Department of Paediatrics Al-Kindy College of Medicine Baghdad University Baghdad, Iraq Reply from the Author

Thank you for your interest in our study. The percentage of patients with hyperlipidemia in our study per disease is not meant to reflect which disease had hyperlipidemia and which disease did not. It was meant to reflect the various diagnosis of patients who had hyperlipidemia and were following up in our clinic.

Meaning that of the 253 children with hyperlipidemia following up at our clinic 2.8% have been diagnosed as metabolic syndrome (MS).

Our paragraph on definition has stated the following regarding the diagnosis of MS, “metabolic syndrome was diagnosed by the presence of 2 or more of the following: insulin resistance and impaired glucose tolerance, elevated total cholesterol and triglyceride concentrations, low circulating high density lipoprotein- cholesterol concentrations, abdominal obesity and high blood pressure.”

Abdulmoein E. Al-Agha Department of Pediatric Endocrinology

King Abdulaziz University Hospital Jeddah, Kingdom of Saudi Arabia

References

1. Al-Agha AE, Alnawab AM, Hejazi TM. Diverse etiology of hyperlipidemia among hospitalized children in Western region of Saudi Arabia. Saudi Med J 2016; 37: 1234-1238.

2. Al-Rubeaan K. National surveillance for type 1, type 2 diabetes and prediabetes among children and adolescents: a population- based study (SAUDI-DM). J Epidemiol Community Health 2015; 69: 1045-1051.

Correspondence

doi: 10.15537/smj.2017.3.17930

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326 Saudi Med J 2017; Vol. 38 (3) www.smj.org.sa

3. Al-Daghri NM, Aljohani NJ, Al-Attas OS, Al-Saleh Y, Alnaami AM, Sabico S, et al. Comparisons in childhood obesity and cardiometabolic risk factors among urban Saudi Arab adolescents in 2008 and 2013. Child Care Health Dev 2016;

42: 652-657.

4. Hothan KA, Alasmari BA, Alkhelaiwi OK, Althagafi KM, Alkhaldi AA, Alfityani AK, et al. Prevalence of hypertension, obesity, hematuria and proteinuria amongst healthy adolescents living in Western Saudi Arabia. Saudi Med J 2016; 37:

1120-1126.

5. Burguete-García AI, Valdés-Villalpando YN, Cruz M.

Definitions for the diagnosis of metabolic syndrome in children.

Gac Med Mex 2014; 150 Suppl 1: 79-87.

6. Al-Hussein FA, Tamimi W, Al Banyan E, Al-Twaijri YA, Tamim H. Cardiometabolic risk among Saudi children and adolescents: Saudi childrens overweight, obesity, and lifestyles (S.Ch.O.O.Ls) study. Ann Saudi Med 2014; 34: 46-53.

Diverse etiology of hyperlipidemia ... Al-Mendalawi & Al-Agha

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